dor123
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| I recently discovered that each time I turn on my Osram Duluxstar 8W/827 on my table lamp, the loudspeakers of my computer sometimes makes a single bang.
Why this is happening?
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.
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I lives in Israel, which is a 220-240V, 50hz country.
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sol
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| If it's on switch start, it could be a faulty condenser in the starter (open circuit). On HF, there is probably a faulty diode or condenser that would normally suppress interference. The mechanics of HF are not my specialty so others may offer more meaningful advice.
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dor123
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| This is a CFLi with an integrated electronic ballast.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.
I only working with the international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
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sol
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| The solution would be to replace it with another unit as this one clearly has a faulty component somewhere in the ballast. Could it be a bad switch in the fixture ?
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hannahs lights
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| Its most likely that the switch on your lamp arcs at switch on due to the high inrush current and this feeds some noise back into the mains which is then picked up by your speakers and makes a bang or thump like you described
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Beta 5
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| try it with a different lamp and see if it still does the same bang, if not get a new CFL, if it does it is the switch and is fine.
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Fluorescent Forever 
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dor123
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| The switch of my table lamp (Which is on the cable), indeed made arcing sound in the past. Now it don't makes, probably because of the low wattage of the current lamp. The additional lamps I have, are Hyundai TEVA 20W WW, Hyundai ECO 15W buglight (2500K), Osram Dulux EL Longlife 23W/840 and Philips Tornado 23W/865.
With the Hyundai ECO 15W "Buglight", the speakers don't make any noise during turning on.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.
I only working with the international date format (dd.mm.yyyy).
I lives in Israel, which is a 220-240V, 50hz country.
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Medved
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| I would guess for the switch arcing. But the question is, how that goes into the loudspeakers: It seems to me the design would be not really excellent, it most likely lack the passive low pass filter on the input of the amplifier. Such filter should be blocking all signals with frequencies above the audio frequency range. The consequence of the missing filter is, the amplifier circuit get some signals way above the range it is able to work, what yields rectification of those HF signals, so flipping them into the audible range and creating strange noise.
It is not only these switching transients, but all the fast transitions and spikes coming from the (cheap) internally digital devices and so driving the amplifier into slew rate limitation. Just a simple low pass filter is able to prevent this and way improve the sound quality of otherwise very cheap amp (typical for these computer speakers)...
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No more selfballasted c***
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